Just to wet the appetite for this a little, I though I would add these examples here.
Darth Vader Unmasked
Got this as part of Chris's SDCC commissions this year. Absolutely beautiful work on this.
Han Solo - I Know
Got this from Chris at Fan Expo in 2010
Chewie (& C-3P0) - companion piece to I Know
Picked up this piece at Fan Expo 2012 from Chris.